Category:Second-order recurrence

After two initial terms ${\displaystyle a_{0}\,}$ and ${\displaystyle a_{1}\,}$, subsequent terms ${\displaystyle a_{n}\,}$ are defined in terms of a formula involving ${\displaystyle a_{n-2}\,}$,

and possibly also ${\displaystyle a_{n-1}\,}$ and/or ${\displaystyle n\,}$.